What Are the IRS Guidelines for Mileage Reimbursement?

Under IRS mileage reimbursement rules, an employer can pay an employee up to 72.5 cents for every business mile driven in a personal vehicle during 2026 without that money counting as taxable wages, provided the payment runs through an accountable plan with proper documentation.¹ Federal law doesn’t force employers to reimburse mileage at all; the IRS rate simply sets the ceiling on what can be paid tax-free.

The 2026 Standard Rates

IRS Notice 2026-10 sets four separate per-mile figures for the 2026 tax year:

72.5 cents for business use, covering fuel, insurance, depreciation, maintenance, and other ownership costs in a single bundled figure.
20.5 cents for medical travel, reflecting only variable costs like gas and oil.
20.5 cents for active-duty members of the Armed Forces relocating under orders for a permanent change of station. The moving expense deduction remains suspended for everyone else.
14 cents for driving in service of a qualifying nonprofit. This rate is fixed by statute and doesn’t change year to year.

The business rate is what governs employer reimbursement. Paying above 72.5 cents per mile isn’t prohibited, but the excess is treated as wages unless the arrangement satisfies a fixed and variable rate (FAVR) plan, discussed briefly below.

Which Miles Qualify as Business Miles

The IRS draws a hard line between business driving and commuting, and getting the classification wrong is one of the most common ways reimbursements become taxable.

Business Miles

Miles driven for the primary purpose of doing work qualify. That includes traveling between job sites during the day, visiting clients, attending off-site meetings, and running errands for the employer. Trips to a temporary work location — one realistically expected to last a year or less — also qualify, even when the drive looks like an ordinary commute.²

Commuting Miles

Daily travel between home and a regular workplace is a personal expense. It never qualifies for tax-free reimbursement, no matter how far the drive or whether the employee takes work calls along the way.²

The Home Office Exception

When a home office qualifies as the principal place of business, trips from home to a client site or another work location in the same trade count as business miles rather than commuting.³ This matters most for remote workers and the self-employed who meet the home office requirements.

Accountable Plans: What Makes Reimbursement Tax-Free

An accountable plan is the structure that keeps mileage payments off the W-2 and out of income tax withholding and payroll taxes.⁴ A plan qualifies only if it meets three tests:

Business connection. The expense must have been incurred while the employee was performing services for the employer.
Substantiation. The employee must give the employer adequate documentation of the mileage within 60 days of when the expense was incurred.⁴
Return of excess. Any advance or reimbursement over the substantiated amount must be returned to the employer within 120 days of when the expense was incurred.⁵

The 60- and 120-day windows are safe harbors. An employer can set shorter internal deadlines. Stretching past them risks converting the whole payment into taxable wages. Parking and tolls incurred for business are reimbursable separately, on top of the per-mile rate.⁶

When Reimbursements Become Taxable

If a reimbursement arrangement fails any of the three accountable-plan tests, every dollar paid under it is treated as wages.⁵ The employer has to include the money in gross income on Form W-2, withhold federal income tax, and pay Social Security and Medicare on the amount. Flat monthly car allowances that aren’t tied to substantiated miles fall into this category by default.

Paying above the IRS rate without proper documentation has the same effect. If an employer pays 80 cents per mile with no accountable plan behind it, the entire 80 cents becomes taxable, not just the 7.5-cent overage.

Records the Employee Has to Keep

Federal tax law requires adequate records to back up any mileage claim.⁷ A mileage log — kept on paper, in a spreadsheet, or through an app — needs to capture, for each trip:

The date.
The destination, identified specifically (client name or business location, not just a city).
The business purpose.
Starting and ending odometer readings, or total miles for the trip.

The IRS expects entries to be made at or near the time of the trip. Reconstructing a log from memory at year-end doesn’t meet the standard. Keep logs and related records for at least three years after filing the return that used them, which matches the general period the IRS has to assess additional tax.⁸

If Your Employer Doesn’t Reimburse You

Most W-2 employees have no federal deduction for mileage their employer refuses to cover. The Tax Cuts and Jobs Act of 2017 eliminated the miscellaneous itemized deduction that used to allow employees to write off unreimbursed business expenses, and the One Big Beautiful Bill Act of 2025 made that elimination permanent. An employee reimbursed below the standard rate, or not at all, generally can’t recover the difference on a personal return.

A narrow set of employees keeps access to an above-the-line deduction for unreimbursed business mileage: members of a reserve component of the Armed Forces, state or local officials paid on a fee basis, and qualified performing artists.¹ Starting in 2026, eligible educators can also claim unreimbursed employee business expenses, including mileage, as an itemized deduction, on top of their existing above-the-line deduction for classroom supplies.

For everyone else, pushing the employer toward a properly structured accountable plan is the practical route to getting vehicle costs covered tax-free.

Self-Employed Drivers

Self-employed workers — freelancers, rideshare drivers, sole proprietors — don’t receive reimbursement. They deduct business mileage directly on Schedule C of Form 1040, using either the 72.5-cent standard rate for 2026 or the actual expense method.¹ The standard rate isn’t available to anyone operating five or more vehicles at the same time.⁶ The same contemporaneous log requirements apply. The restrictions that took the deduction away from most W-2 employees don’t affect Schedule C filers.

State Law Can Require Reimbursement

Federal law sets no reimbursement mandate. Several states do. California, Illinois, and Massachusetts have labor laws requiring employers to cover necessary business expenses, which can include vehicle costs. Even in states without a specific rule, federal wage-and-hour law requires reimbursement when unreimbursed expenses would drop an employee’s effective pay below the minimum wage.

FAVR Plans as an Alternative

Some employers use a fixed and variable rate plan instead of a flat per-mile figure. A FAVR plan splits reimbursement into a periodic fixed payment for ownership costs (depreciation, insurance, registration) and a variable payment for operating costs based on actual miles driven. It has stricter conditions: the plan must cover at least five employees, each covered employee must substantiate at least 5,000 business miles a year, and the standard automobile cost used in the calculation can’t exceed $61,700 for 2026.¹ When run correctly, FAVR payments are tax-free on the same footing as accountable-plan reimbursements at the standard rate.

1
IRS. 2026 Standard Mileage Rates, Notice 2026-10
2
Internal Revenue Service. Publication 463 (2024), Travel, Gift, and Car Expenses
3
Internal Revenue Service. Publication 463 (2024), Travel, Gift, and Car Expenses – Section: Transportation
4
Internal Revenue Service. Rev. Rul. 2003-106
5
eCFR. 26 CFR 1.62-2 – Reimbursements and Other Expense Allowance Arrangements
6
Internal Revenue Service. Topic No. 510, Business Use of Car
7
Office of the Law Revision Counsel. 26 USC 274 – Disallowance of Certain Entertainment, Etc., Expenses
8
Office of the Law Revision Counsel. 26 USC 6501 – Limitations on Assessment and Collection